Once 6.X.X, you should then be able to speak to you vendor and arrange to get a pathc upgrade, which should be free as part of your support, or you can download yourself if you have the access to the CCO download page. Use the OS Admin guide, SRND (Call Control section) and the release notes for the specific version you are upgrading to on how to upgrade.
I think you need to upgrade from that version to either 6.1.X. There were 6.0.1 versions I had the issue with last year during the clock change (not sure if this is one of them). Speak to you Vendor about getting the patch upgrade or download it from here if you have CCO access
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.